PSLE Linda saved $1200 in September. This amount was a 20% increase from what she saved in August. The amount she saved in October was a 5% decrease from what she saved in September.
- What was the total amount that Linda saved from August to October?
- What was the percentage increase in the amount Linda saved in October compared to August?
|
Savings |
August |
100% |
|
Change |
+ 20% |
|
September |
120% |
100 u |
Change |
|
- 5 u |
October |
|
95 u |
(a)
Savings in August = 100%
Savings in September = 100% + 20% = 120%
120% = 1200
1% = 1200 ÷ 120 = 10
Savings in August
= 100%
= 100 x 10
= $1000
Savings in September = 100 u
Savings in October = 100 u - 5 u = 95 u
100 u = 1200
1 u = 1200 ÷ 100 = 12
Savings in October
= 95 u
= 95 x 12
= $1140
Total savings from August to October
= 1000 + 1200 + 1140
= $3340
(b)
Increase in savings in October compared to August
= 1140 - 1000
= $140
Percentage increase
=
Increase in savingsSavings in August x 100%
=
1401000 x 100%
= 14%
Answer(s): (a) $3340; (b) 14%